本文選題：Inconel　切入點(diǎn)：718合金　出處：《南昌航空大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：Inconel 718合金構(gòu)件的傳統(tǒng)制造工藝為鍛造,而相比傳統(tǒng)的鍛造成形工藝,3D打印技術(shù)具有生產(chǎn)周期短、易于制備復(fù)雜零件以及生產(chǎn)成本低等特點(diǎn),因此本文采用3D打印的激光選區(qū)熔化(SLM)工藝制備了Inconel 718合金/TiC納米顆粒增強(qiáng)Inconel 718合金構(gòu)件,并對(duì)該合金進(jìn)行了固溶處理、固溶+時(shí)效處理,研究了不同熱處理工藝下合金組織演變規(guī)律和δ相、γ"相和γ′相等析出相析出規(guī)律。研究了析出相和TiC納米顆粒添加與合金力學(xué)行為(抗拉強(qiáng)度、維氏硬度和延伸率)的關(guān)聯(lián)關(guān)系,并分析了相關(guān)影響機(jī)制。主要結(jié)論如下:SLM成形Inconel 718合金沉積態(tài)組織中存在似橢圓狀痕跡,其大小不一,具有明顯方向性;橢圓狀組織由柱狀晶組成。合金經(jīng)940℃~1100℃固溶后,柱狀晶轉(zhuǎn)變?yōu)榈容S細(xì)晶,組織可析出兩種形貌特征δ相:短棒狀和針狀,δ相的化學(xué)式為Ni3Nb。在固溶溫度為940℃~980℃時(shí),在晶界可析出短棒狀δ相,而晶內(nèi)析出針狀δ相,且斷口表面存在大小不均的韌窩和少量孔洞、裂紋源,明顯表現(xiàn)為塑性斷裂特征。固溶溫度超過(guò)1000℃時(shí),晶內(nèi)針狀δ相基本消失,主要為晶界處短棒狀δ相析出,數(shù)量明顯減少,且斷口處韌窩相比固溶溫度較低時(shí)增多增大。短棒狀δ相析出可阻礙合金在拉伸塑性變形過(guò)程中的位錯(cuò)運(yùn)動(dòng),是合金在940℃~980℃固溶后其抗拉強(qiáng)度和維氏硬度明顯高于沉積態(tài)的主要因素之一。合金在固溶溫度為1020℃~1100℃時(shí),組織中晶粒與固溶溫度為940℃~980℃時(shí)相比明顯粗化,且因有害相Laves相基本溶解和枝晶偏析現(xiàn)象得到改善,合金延伸率有所提高。合金在620-720℃時(shí)效處理后在晶內(nèi)析出大量彌散分布的針狀δ相,以及圓盤(pán)狀γ"相和細(xì)小黑點(diǎn)狀γ′相。γ"和γ′相與基體γ相共格,可產(chǎn)生顯著的共格強(qiáng)化效果,是合金經(jīng)時(shí)效處理后抗拉強(qiáng)度顯著提高的主要原因之一。合金添加TiC顆粒后,其沉積態(tài)組織中柱狀晶粒更細(xì)小,且在熱處理過(guò)程中其組織中析出相與未添加TiC時(shí)具有相似的析出規(guī)律。由于TiC顆粒與基體結(jié)合良好,在相同熱處理工藝條件下與未添加TiC相比,合金因TiC顆粒的強(qiáng)化作用,其抗拉強(qiáng)度明顯提高。
[Abstract]:The traditional manufacturing process of Inconel 718 Alloy Components for forging, and compared with the traditional forging technology, 3D printing technology has a short production cycle, easy preparation of complex parts and low production cost, so this paper uses the selective laser melting of 3D printing (SLM) technology for preparation of Inconel 718 Alloy /TiC nano particle reinforced Inconel 718 Alloy the component, and the alloy solid solution treatment, solid solution and aging treatment of different heat treatment on the microstructure evolution process and gamma delta phase, and gamma prime precipitates "equal precipitation was studied. The precipitates and adding TiC nanoparticles and alloy mechanical behavior (tensile strength, hardness and elongation of Vivtorinox the rate of) the association, and analyzed the influence mechanism. The main conclusions are as follows: SLM forming elliptical trace exists Inconel 718 Alloy Deposited in its size, has the obvious direction ; elliptical tissue is composed of columnar crystal alloy. By 940 DEG ~1100 DEG after solid solution, the columnar to equiaxed grains, the organization can be separated two kinds of morphology of delta phase: short rod and acicular, chemical formula of delta phase Ni3Nb. in the solution temperature is 940 DEG ~980 DEG. Precipitation of short rod Delta phase at the grain boundaries, and the precipitation of intragranular acicular delta phase, and the fracture surface has uneven size of dimples and a small hole, crack source is obviously plastic fracture characteristics. The solution temperature more than 1000 DEG C, intragranular acicular 5-stabilized disappeared, mainly in the grain boundary of short rod delta phase precipitation, significantly reduce the number of fracture and dimple compared to solid solution at low temperature increase. Short rod delta phase precipitation can hinder dislocation motion in the alloy tensile plastic deformation process, is one of the main factors of the alloy at 940 DEG ~980 DEG solution after the tensile strength and hardness was higher than Vivtorinox deposited. Gold in the solution temperature is 1020 DEG ~1100 DEG C, in grain coarsening compared with solid solution temperature of 940 DEG ~980 DEG C, and due to the harmful Laves phase basic dissolution and dendrite segregation phenomenon has been improved, the elongation of the alloy is improved. The alloy after aging treatment at 620-720 DEG C in amorphous precipitate the dispersed phase and the disc delta needle, "and small black spots like gamma gamma prime. Gamma and gamma prime phase and matrix phase coherent gamma, can produce significant precipitation strengthening effect, is one of the main reasons of alloy after aging tensile strength increased significantly. The alloy added TiC particles after its deposition in the microstructure of columnar grain is finer, and in the process of heat treatment and precipitation in the tissue without the addition of TiC has the similar rule. Due to the precipitation of TiC particles and matrix is good, in the same heat treatment conditions compared with those without adding TiC, because TiC alloy particles The tensile strength is obviously improved.

【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG132.3;TG166.7

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